1.mysql> create database aa;
ERROR 1044 (42000): Access denied for user ''@'localhost' to database 'aa'
这是匿名用户的意思~~~虽然你以为你是root登录
解决办法：改真实的root登录
F:Softwaresmysql5mysql⑸.6.24-winx64in>mysql --user=root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or g.
Your MySQL connection id is 12
Server version: 5.6.24 MySQL Community Server (GPL)
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mysql> create database dbb;
Query OK, 1 row affected (0.00 sec)
注意，mysql --user=root -p 是让你用root身份登录，所以下面出现的password是root的密码，默许为空，直接enter。
F:Softwaresmysql5mysql⑸.6.24-winx64in>mysql --user=root -p
Enter password: ******
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: Y
ES)
这就表示密码毛病。